4 files changed, 34 insertions, 6 deletions
diff --git a/engine/utils/coding.ts b/engine/utils/coding.ts
new file mode 100644
index 0000000..3f78889
--- /dev/null
+++ b/engine/utils/coding.ts
@@ -0,0 +1,27 @@
+const replacer = (_key: any, value: any) => {
+  if (value instanceof Map) {
+    return {
+      dataType: 'Map',
+      value: Array.from(value.entries())
+    };
+  } else {
+    return value;
+  }
+};
+
+const reviver = (_key: any, value: any) => {
+  if (typeof value === 'object' && value !== null) {
+    if (value.dataType === 'Map') {
+      return new Map(value.value);
+    }
+  }
+  return value;
+};
+
+export const stringify = (obj: any) => {
+  return JSON.stringify(obj, replacer);
+};
+
+export const parse = <T>(str: string) => {
+  return JSON.parse(str, reviver) as unknown as T;
+};
diff --git a/engine/utils/dotProduct.ts b/engine/utils/dotProduct.ts
index 59f8857..82bcdea 100644
--- a/engine/utils/dotProduct.ts
+++ b/engine/utils/dotProduct.ts
@@ -1,4 +1,4 @@
-import type { Coord2D } from "../interfaces";
+import type { Coord2D } from '../interfaces';
 
 export const dotProduct = (vector1: Coord2D, vector2: Coord2D): number =>
   vector1.x * vector2.x + vector1.y * vector2.y;
diff --git a/engine/utils/index.ts b/engine/utils/index.ts
index 82a0d05..65446d1 100644
--- a/engine/utils/index.ts
+++ b/engine/utils/index.ts
@@ -1,3 +1,4 @@
-export * from "./rotateVector";
-export * from "./dotProduct";
-export * from "./clamp";
+export * from './rotateVector';
+export * from './dotProduct';
+export * from './clamp';
+export * from './coding';
diff --git a/engine/utils/rotateVector.ts b/engine/utils/rotateVector.ts
index 82bb54d..221ffb2 100644
--- a/engine/utils/rotateVector.ts
+++ b/engine/utils/rotateVector.ts
@@ -1,4 +1,4 @@
-import type { Coord2D } from "../interfaces";
+import type { Coord2D } from '../interfaces';
 
 /**
  * ([[cos(θ), -sin(θ),])  ([x,)
@@ -10,6 +10,6 @@ export const rotateVector = (vector: Coord2D, theta: number): Coord2D => {
 
   return {
     x: vector.x * cos - vector.y * sin,
-    y: vector.x * sin + vector.y * cos,
+    y: vector.x * sin + vector.y * cos
   };
 };